Air-brake-release valve



Mamh 2s 1926. 1,577,494

P. B. ROHNER AIR BRAKE RELEASE VALVE Filed Oct. 23, 1925 Fatented'li lar. P3, 1926. l UNITED STATES PATENT orrics.

PHILIP 3B. ROI-INER, or cannons, Iowa, assrcuvota on ONE-HALF T ANDREW A.

nnnns, or oAanoLL, Iowa.

AIR-BRAKE-RELEASE VALVE.

To all whom it may concern. in the marginal portion of the lower end of Be it known that I, PHILIP B. ROHNER, of the coupling for a purpose whichwill pres- Carroll, in the county of Carroll and State ently appear. The lower body member 2 is of Iowa, a citizen of the United States, have cupped or dished in the bottom of the chaminvented certain new and useful Improveher 17 in which the lower end of the coupling 0 ments in Air-Brake-Release Valves, of is secured, and through wall of said cupped which the following is a specification. bottom are formed one or more auxiliary This invention relates to air-brake release ports 18. A nipple 19 depends from the valves of the type disclosedin Letters-Patbodymember 2 and is threaded into the cut No. 1,452,495, issued April 24, 1928, the cylinder 15, as shown. The auxiliary ports 65 object of the present invention being to pro- 18 are normally closed by a diaphragm 20 vide a construction which will reduce flow of rubber or like material which is shaped through the diaphragm when the brake ,is to normally, form an inverted cone, seating to be released so that the air will be caused snugly on the bottom of the chamber in the to escape through the lowest or auxiliary upper end of the body member 2 and ex- 0 port. The invention is illustrated in the actending over and closing the ports 18. In companying drawing and will be hereinafter the apex of the diaphragm, a narrow slit 21 fully set forth and defined. is formed therethrough. Under normal In the drawingsconditions, the slit 21 is open, as shown in Figure 1 is a sectional elevation of a re- Figure 2, and air from the cylinder 15 75 lease valve with the parts in normal posiflows therethrough to and through the inti termediate port 11 and acts upon the valve Figure 2 1s a top plan view of the dia- 7 to hold it seated. phragm as it appears in Figure l; and f0 release thebrakes, the rocker 9 is ac Figure 0 is a bottom plan view of the tuated to depress and unseat the valve 7 di h as it appears h releasing th whereupon the air will rush to and through b k the main outlet port. The increased pres- The main valve body comprises an upper sure thus exerted upon the diaphragm lifts member 1, a lower member 2, and a coupling it from its seat and drives it against the 30 sleeve 3 threaded into the opposed meeting lower end of the coupling to cover and close ends of the two members whereby to secure the intermediate point, folding or inverting them rigidlytogether. The bore of the upof the diaphragm resulting. During this per body member 1 is so shaped as to proaction any air which may be trapped bevide a valve chamber at therein and the main tween the diaphragm and the coupling will outlet port 5 leads from the bore and comescape through the grooves 16 and around 99 municates with said chamber through the the ed e of the diaphragm to pass out bore which is preferably lined with a bush through the auxiliary ports 18. Instantly ing 6, the lower end of the bushing extcndupon the diaphragm being lifted, the rocker ing into the chamber a and providing a seat may be released permitting the valve 7 to for the main valve 7. A stem 8 rises from seat whereupon the air pressure will hold the valve to bear against a rocker 9 mounted the diaphragm raised until, by escaping on top of the valve body whereby the valve through the auxiliary ports 18, it is reduced may be moved to open position. A stem 10 to the desired degree whereupon the diadepends from the valve through the coupling phragm will return to nor nal position.

and fits loosely in the intermediate port 11 When the diaphragm is lifted and reversed provided at the center of the coupling by upon itself as described, the walls of the the bore thereof, the bore of the coupling slit 21 are pressed together so that flow being enlarged, as at 12, above the port to through the diapl'iragm is cut oil and the provide a support for the spring 13 which diaph'agm will be held to the port 11 to acts with the air pressure to hold the valve close the same. Should air be trapped above 305 7 normally seated. The lower end of the the diaphragm, vibration of the diaphragm coupling is flared, as at 14, to provide a will resut and this will produce a pumping chamber which will direct air escaping from action driving the air around the edge of the brake cylinder or auxiliary reservoir 15 the diaphragm to the ports 18. The grooves i 55 to the port 11. Slight grooves 16 are formed 16 facilitate this circulation, 1

Having thus fully described my invention, what I claim as new and desire to secure by Letters Patentof the United States, is

1. In a brake release device, a diaphragm having normally an inverted conical form with its apex presented to the flow of pressure fluid, there being a narrow slit through the apex of the diaphragm held open under normal pressure but closing under increased pressure which tends to flatten and invert the diaphragm.

2. In a brake release device, the combination of upper and lower body members, a coupling connecting said members, and provided with grooves in the marginal portion of its lower end, and an outlet port in the upper body member, a manually operable valve contro ling flow to said outlet port, an auxiliary outlet port in the lower body member, an inlet portion in the lower body member, and a diaphragm seating on the lower body member and normally closing the auxiliary outlet, said diaphragm having a narrow slit therethrough normally open to permit passage of pressure fluid but closing under increased pressure tending to seat the diaphragm against the coupling whereby to cut oil flow to main outlet port and direct flow to the auxiliary outlet port.

3. In a b 'ake release device, the eombination of upper and lower body members, a coupling connecting said members, an outlet port in the upper body member, a manually operable valve controlling flow to said outlet port, an auxiliary outlet port in the lower body member, an inlet portion in the lower body member. and a diaphragm seating on the lower body member and normally closing the auxiliary outlet, said diapl'lragm having a narrow slit therethrough normally open to permit passage of pressure fluid but closing under increased pressure tending to seat the diaphragm against the coupling whereby to cut oil flow to main outlet port and direct flow to the auxiliary outlet port.

In testimony whereof I hereunto aflix my signature.

PHILIP B. ROHNER. 

